Processors

→ extracts language concept from a given processing context

• orchestrated by traversers

Consists of:

• an execution condition, determining in which concrete context the processor should be executed
• a preChildrenProcessing function that can be used to execute logic before the concept extraction for any AST child nodes is attempted
  • usually used to set up local contexts
• a postChildrenProcessing function that constructs new language concept objects and returns them as a concept map
  • receives processing context and a concept map containing all previously extracted child concepts as input
  • when composing more complex concept object out of child concepts, then these child concepts should be removed from their concept map

Implementation

classDiagram
	class Processor {
		<<abstract>>
		+ExecutionCodition executionCondition*
		+preChildrenProcessing(ProcessingContext context) void
		+postChildrenProcessing(ProcessingContext context, ConceptMap childConcepts) ConceptMap
	}
	ConcreteProcessor
	Processor <|-- ConcreteProcessor

• empty default implementations should be provided for preChildrenProcessing and postChildrenProcessing